Automotive Laminated Glass Strength Profiling for Pedestrian Impact
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Solution Overview
Problem
Automobile windshield glass often has localized regions of excessively high strength, which can lead to inadequate impact absorption during collisions with pedestrians or cyclists, resulting in increased bodily harm due to the glass's failure to break appropriately and the interlayer film's inability to function effectively in absorbing impact.
Innovation Solution
A method for producing laminated glass for automobile windows involves heating and bend-forming glass plates and bonding them with an interlayer film, where one glass plate is scratched by a conveying unit before bonding to ensure the scratched surface is on the vehicle-interior side, thereby reducing the in-plane strength uniformity and enhancing impact absorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the glass plate has high overall strength to ensure toughness, then the glass can maintain structural integrity, but localized high-strength regions prevent appropriate breakage during collision, reducing impact absorption
Solution Approach 1:
The patent applies local quality by creating a non-uniform strength distribution across the glass plate surface. Specifically, the strength varies in the vertical direction with higher strength at the upper portion and lower strength at the lower portion, allowing the glass to break appropriately during collision while maintaining overall structural integrity. This local variation in strength properties enables different regions to serve different functions: the upper region maintains toughness while the lower region facilitates controlled breakage for impact absorption.
2Object-affected harmful factors
If the glass plate strength is reduced to enable breakage during collision, then impact absorption improves, but the glass loses requisite toughness and cannot ensure safety
Solution Approach 1:
The patent resolves this contradiction by implementing local quality through vertical strength variation. The glass plate is designed with higher strength at the upper portion to maintain toughness and structural integrity, and lower strength at the lower portion to enable appropriate breakage and impact absorption. This spatial differentiation of strength properties allows the glass to simultaneously exhibit both toughness and controlled breakability in different regions.
3Manufacturing precision
If the in-plane strength distribution is made uniform, then manufacturing complexity increases, but localized high-strength regions cause inadequate breakage behavior
Solution Approach 1:
The patent applies asymmetry by deliberately creating a non-uniform strength distribution across the glass plate. Instead of making the strength distribution uniform, the patent designs the glass with asymmetric strength characteristics: higher strength at the upper portion and lower strength at the lower portion. This asymmetric strength profile is specifically engineered to enable appropriate breakage behavior during collision, where the lower-strength region facilitates controlled fracturing while the higher-strength region maintains overall structural integrity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method produces laminated glass with improved toughness and bodily protection performance by ensuring the glass breaks appropriately during collisions, allowing the interlayer film to effectively absorb impact and prevent penetration, thus enhancing safety for pedestrians and cyclists.
Implementation Method 1
either a conveying unit-facing surface of the at least one glass plate or a non-facing surface of the at least one glass plate that is opposite to the conveying unit-facing surface is scratched by the conveying unit
Implementation Method 2
heating and bend forming two glass plates
Implementation Method 3
bonding together the two bend-formed glass plates via an interlayer film
Data Source
AI summary
A method for producing laminated glass for automobile windows includes:heating and bend forming two glass plates; andbonding together the two bend-formed glass plates via an interlayer film, wherein before the heating and bend forming of the two glass plates, at least one glass plate of the two glass plates that are flat, is conveyed by a conveying unit while either a conveying unit-facing surface of the at least one glass plate or a non-facing surface of the at least one glass plate that is opposite to the conveying unit-facing surface is scratched by the conveying unit, andin the bonding together of the two bend-formed glass plates via the interlayer film, the scratched surface is disposed such that the scratched surface is situated on a vehicle-interior side upon the laminated glass for automobile windows being attached to an automobile.